SushiNoms is a UK based website but they also ship worldwide.
You can find them at anime conventions over the UK like MCM Comic Con and Hyper Japan.

The AmaiBox is the UKs first Japanese snack and candy subscription box, it comes in two sizes. The AmaiBox mini comes in asmaller box but is full of tasty treats and the AmaiBox GIGA is slightly biggerand includes a drink and a bag of crisps/large bag of sweets. There are 3 subscription tiers, 1 month, 3 months and 6 months, six months will give you the most saving overall.